2NV9:
reference: X-ray Structure of Paramecium bursaria Chlorella Virus Arginine Decarboxylase: Insight into the Structural Basis for Substrate Specificity., Shah R, Akella R, Goldsmith EJ, Phillips MA, Biochemistry. 2007 Mar 13;46(10):2831-41. Epub 2007 Feb 17. PMID: 17305368

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).